S.T.A.L.K.E.R. - Clear Sky
S.T.A.L.K.E.R.: Clear Sky, is the stand-alone prequel for S.T.A.L.K.E.R.: Shadow of Chernobyl, a first-person shooter computer game by Ukrainian developer GSC Game World. The game consists of a roughly 50/50 mix of new areas and old, remodeled areas from the previous game. The X-ray graphics engine has been updated to version 1.5 and includes DirectX 10 support (later patch 1.5.06 included DirectX 10.1). Additionally, the AI received an overhaul to accommodate the new faction wars feature.
Clear Sky has always been a winner for ATI and here's no different with the HD 5870 getting good numbers across the board. While the NVIDIA cards don't break the 30 FPS minimum we want at any resolution, we can see the HD 5870 is able to at both 1680 x 1050 and 1920 x 1200.